EP3849859B1 - Hydrodynamic retarder - Google Patents

Hydrodynamic retarder Download PDF

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Publication number
EP3849859B1
EP3849859B1 EP19765438.7A EP19765438A EP3849859B1 EP 3849859 B1 EP3849859 B1 EP 3849859B1 EP 19765438 A EP19765438 A EP 19765438A EP 3849859 B1 EP3849859 B1 EP 3849859B1
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EP
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Prior art keywords
working
medium
working medium
line
hydrodynamic retarder
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EP19765438.7A
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German (de)
French (fr)
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EP3849859A1 (en
EP3849859C0 (en
Inventor
Benedikt GOTH
John Patrick Wittmann
Martin Blumenstock
Dieter Laukemann
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Voith Patent GmbH
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Voith Patent GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T10/00—Control or regulation for continuous braking making use of fluid or powdered medium, e.g. for use when descending a long slope
    • B60T10/02—Control or regulation for continuous braking making use of fluid or powdered medium, e.g. for use when descending a long slope with hydrodynamic brake
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
    • B60T1/02—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels
    • B60T1/08—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels using fluid or powdered medium
    • B60T1/087—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels using fluid or powdered medium in hydrodynamic, i.e. non-positive displacement, retarders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D57/00—Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders
    • F16D57/04—Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders with blades causing a directed flow, e.g. Föttinger type

Definitions

  • the present invention relates to a hydrodynamic retarder with an internal working medium circuit in a working space of the retarder, here called working space working medium circuit, and an external working medium circuit in which a heat exchanger is arranged, in detail according to the preamble of claim 1.
  • a hydrodynamic retarder as the present invention relates to it, can be positioned, for example, in a vehicle transmission and/or can be operated with the working medium of the transmission, in particular oil. If the working medium is supplied to the retarder via the transmission working medium, only the working medium pressure of the transmission is available to fill the working chamber of the retarder.
  • a generic retarder is in EP 2 300 696 B1 disclosed.
  • This hydrodynamic retarder has an external working medium circuit to which working medium can be supplied via a working medium supply line in order to fill the working chamber of the retarder.
  • the working medium supply line is connected to a retarder switching valve and can be connected via this to a working medium pressure line (working pressure level) and a tank line, so that working medium can also be discharged from the external working medium circuit via the working medium supply line.
  • the working chamber of the retarder is filled and emptied via what is known as gap filling or gap emptying and the external working medium circuit.
  • the external working medium circuit is connected to a working medium inlet and a working medium outlet, which each open out into the working space on a torus outer diameter of the working space. Due to the circulatory flow of the working medium in the working space, there is a comparatively high pressure on this outer diameter of the torus.
  • a retarder in which a connecting line is connected between the working medium container and the hydrodynamic center of the retarder, with a valve being arranged in the connecting line.
  • working medium In order to set a specific braking torque that is to be generated with the hydrodynamic retarder, working medium must be supplied to or removed from the external working medium circuit.
  • This supply and discharge can be regulated, for example, by the named directional control valve with the working medium pressure line connection and the tank line connection.
  • the external working medium circuit opens out on the outer diameter of the torus via the working medium inlet, a relatively high pressure is required to fill the circuit.
  • This required pressure can be greater than the maximum pressure made available by the transmission working medium, which is determined by the pressure supply of the transmission. The consequence of this is that in this case only comparatively small braking torques can be controlled with the retarder.
  • the present invention is therefore based on the object of improving a generic hydrodynamic retarder in such a way that a sufficiently large braking torque can be generated with the hydrodynamic retarder even at lower working medium pressures in the working medium pressure line.
  • the various different pressure levels within the hydraulic system in the working space working medium circuit and external working medium circuit are used to control or regulate the filling and emptying of the working space or the setting of the optimal degree of filling.
  • the accuracy when setting the desired degree of filling of the working space with working medium can be improved.
  • minimizing the return flow of hot working medium, which was heated in the working chamber, into the tank, which is usually formed by the oil sump of the transmission, is advantageous.
  • a hydrodynamic retarder has a rotor and a stator or a rotor and a counter-rotating rotor, the rotor and the stator or the rotor and the counter-rotating rotor together forming a toroidal working chamber that can be filled with working medium in order to transfer torque from the rotor by means of a hydrodynamic working chamber working medium circuit to the stator or from the rotor to the counter-rotating rotor and thus to brake the rotor.
  • the working medium is in particular oil, for example transmission oil, if the hydrodynamic retarder is connected to a vehicle transmission, is supplied from its oil supply and/or is integrated into this vehicle transmission.
  • the hydrodynamic retarder also has an external working medium circuit in which a heat exchanger is provided in order to dissipate heat from the working medium heated in the working chamber.
  • the external working medium circuit is connected via a working medium inlet and a working medium outlet to the working chamber of the retarder, the working medium inlet and the working medium outlet ending in the working chamber on a torus outside diameter of the working chamber.
  • the opening is on the diameter of the torus wall and—seen in an axial section through the working space—not radially further inwards is positioned within the torus cross-section.
  • the working medium inlet and/or the working medium outlet open in the gap between the two impellers facing one another in the axial direction, which form the rotor and the stator or the rotor and the counter-rotating rotor.
  • a working medium supply line is provided, which opens into the external working medium circuit.
  • a core ring filling line is also connected to the working chamber of the retarder to carry the working medium, the core ring filling line opening radially inside the outer diameter of the torus in a core ring of the working chamber.
  • a comparatively low pressure prevails in such a core ring, so that the working chamber can be filled with working medium comparatively more easily even if the working medium filling pressure available is limited.
  • the configuration according to the invention thus advantageously enables gap filling and gap emptying, in particular pure gap filling and pure gap emptying of the working space, and in addition to this, in particular in a different switching position of a directional control valve, by means of which the working medium supply line is preferably connected to a working medium pressure line and in particular to a tank line, core ring filling with separate gap emptying.
  • the removal of the working medium from the working space can take place via a gap emptying. This can in the working medium supply in the Working space and the working medium discharge from the working space are used in each case the maximum possible pressure difference.
  • the working medium supply line is preferably connected to a working medium pressure line and in particular to a tank line by means of a directional valve, with the directional valve being particularly advantageously designed as a pressure compensator, the control piston of which is on the one hand connected to the pressure of the external working medium circuit, in particular in or behind the working medium outlet, and on the other hand in an opposite direction Direction, with a control pressure from a control pressure line, via which the desired braking torque of the hydrodynamic retarder is specified and which is in particular proportional to the desired braking torque, is applied.
  • the core ring filling line branches off from the working medium supply line. Particularly in this case, it is favorable if, in the direction of flow of the working medium in the working medium supply line, based on a filling of the external working medium circuit via the working medium supply line with working medium, a throttle is provided in the working medium supply line behind a branching point of the core ring filling line in order to reduce a predetermined pressure difference in the working medium supply line to create.
  • both throttles are provided, they can be matched to one another in terms of flow cross-section in order to achieve the desired extent of core ring filling.
  • the throttle(s) can be designed as a constant throttle or variable throttle.
  • the directional valve can be designed as a 3/2-way valve, for example in the form of the pressure compensator shown above.
  • the core ring filling line is provided parallel to and separate from the working medium supply line. This means that the working medium flowing through the working medium supply line cannot flow into the core ring filling line.
  • the core ring filling line and the working medium supply line are connected to different connections or outlets of the directional control valve.
  • the directional valve can be designed as a 4/2-way valve.
  • the working medium supply line can be flowed through by the working medium in two opposite directions in order to not only be able to supply working medium via the working medium supply line to the external working medium circuit and thus the working chamber of the retarder, but also to be able to discharge it from the external working medium circuit in order to empty it .
  • the supply and discharge can preferably be achieved in the same switching position of the directional control valve and are adjusted as a function of the prevailing pressure conditions, and in particular as a function of the control pressure in the control pressure line, via which the retarder braking torque is specified.
  • a control piston of the directional control valve is shifted to a certain extent within the same switching position, so that the control edges adjust the pressure difference across the directional control valve in order to achieve the desired filling and emptying.
  • the setting can be achieved, for example, by the design of the directional control valve as a pressure compensator.
  • Directional valves are preferably provided in the external working medium circuit in the direction of flow of the working medium before and after the heat exchanger in order to selectively decouple the heat exchanger from the external working medium circuit.
  • a directional control valve is provided upstream of the heat exchanger in the direction of flow, which connects the associated connection of the external working medium circuit either to the heat exchanger and optionally to a tank line.
  • a directional control valve can be provided, which optionally connects the associated connection of the heat exchanger to the connection of the external working medium circuit and a tank line, which can also be connected to the directional control valve in or before the working medium supply line to carry the working medium.
  • the working medium outlet opening onto the outer diameter of the torus allows the working medium to be discharged from the working space, so that particularly small braking torques can also be set.
  • full filling can be achieved by filling the core ring.
  • a hydrodynamic retarder 1 with an external working medium circuit 6 is shown schematically.
  • the external working medium circuit 6 is connected to a working chamber 4 of the retarder 1 via a working medium inlet 8 and a working medium outlet 9 . Details of the connection and the working space 4 are in the figure 2 shown schematically.
  • the working chamber 4 is formed by a bladed rotor 2 and a bladed stator 3 .
  • the rotor 2 and the stator 3 face each other in the axial direction, ie in the direction of the axis of rotation of the rotor 2, with an axial gap.
  • the working medium in the working chamber 4 is accelerated radially outwards, enters the stator 3 , is decelerated there radially inwards and re-enters the rotor 2 radially inwards.
  • a hydrodynamic working space working medium circuit 5 is thus formed.
  • the working space 4 shown in cross-section is toroidal over the circumference of the axis of rotation of the rotor 2 , the torus having a corresponding outer toroidal diameter D .
  • the outer torus diameter D refers to the diameter of the full circle from which the torus is formed in the mathematical sense by rotation around the axis of rotation.
  • the so-called core ring 12 of the work space 4 is located at least approximately in the middle of the outer torus diameter D or of the work space 4 , which is correspondingly determined by the eye of the work space working medium circuit 5 . Both the working medium inlet 8 and the Working medium outlet 9 open out on the torus outside diameter D of the working space 4 in the working space 4.
  • the core ring filling line 11 opens in the working space 4.
  • This core ring filling line 11 opens in the core ring 12, i.e. at a point in the working space 4 with a comparatively low working medium pressure, in particular the lowest working medium pressure, whereas the working medium outlet 9 in particular opens at a point of high pressure in the working space 4.
  • the opening of the working medium outlet 9 can, for example, also be provided further radially outwards in the working chamber 4 in relation to the axis of rotation of the rotor 2 .
  • the positions of the working medium inlet 8 and the working medium outlet 9 shown here can be interchanged with one another.
  • the core ring filling line 11 is provided in addition to a working medium supply line 10 which is connected in particular to the external working medium circuit 6 outside of a retarder housing.
  • the working medium supply line 10 and the core ring filling line 11 are connected to connections of a common directional control valve 16, which is designed as a pressure compensator.
  • the directional control valve 16 has two switching positions and, in addition to the connections mentioned for the working medium supply line 10 and the core ring filling line 11, a connection for a working medium pressure line 17 and a connection for a tank line 18.
  • the directional control valve 16 is therefore designed as a 4/2-way valve.
  • One of the oppositely positioned and counteracting pressure connections of the directional control valve 16 is connected to the external working medium circuit 6 behind the working medium outlet 9 and the other to a control pressure line 21, via the control pressure of which the desired Braking torque of the hydrodynamic retarder 1 is set, connected.
  • the control pressure line 21 also acts on a directional valve 19 in the direction of flow of the working medium in the external working medium circuit 6 upstream of a heat exchanger 7 and a directional valve 20 in the direction of flow of the working medium in the external working medium circuit 6 downstream of the heat exchanger 7. This makes it possible to switch the heat exchanger 7 on and off as desired to switch the external working medium circuit 6 in order to use the heat exchanger 7 for cooling the working medium from the retarder 1 or for other cooling purposes.
  • the switched-off state of the heat exchanger 7 is shown, in which the external working medium circuit 6 is connected to the tank 22 on the output side of the directional control valve 19 and the directional control valve 20 connects the heat exchanger 7 to the tank line 18 .
  • the working medium supply line 10 can be flowed through by the working medium in both directions, either to supply working medium to the external working medium circuit 6 or to remove it from it.
  • connection of the core ring filling line 11 is different from the embodiment according to FIG figure 1 executed.
  • the same reference numerals being used for corresponding components.
  • the core ring filling line 11 branches off from the working medium supply line 10 .
  • the throttles 14 and 15 are provided, the throttle 14 in the working medium supply line 10 behind the branch point of the core ring filling line 11 and the throttle 15 in the core ring filling line 11.
  • the directional control valve 16 can thus be designed as a 3/2-way valve, with only three connections, since the separate connection of the working medium pressure line 17 to the core ring filling line 11, as in FIG figure 1 shown can be omitted.
  • the branching point of the core ring filling line 11 from the working medium supply line 10 is denoted by 13 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Braking Arrangements (AREA)
  • Transmission Of Braking Force In Braking Systems (AREA)

Description

Die vorliegende Erfindung betrifft einen hydrodynamischen Retarder mit einem internen Arbeitsmediumkreislauf in einem Arbeitsraum des Retarders, vorliegen Arbeitsraumarbeitsmediumkreislauf genannt, und einem externen Arbeitsmediumkreislauf, in dem ein Wärmetauscher angeordnet ist, im Einzelnen gemäß dem Oberbegriff von Anspruch 1.The present invention relates to a hydrodynamic retarder with an internal working medium circuit in a working space of the retarder, here called working space working medium circuit, and an external working medium circuit in which a heat exchanger is arranged, in detail according to the preamble of claim 1.

Ein hydrodynamischer Retarder, wie ihn die vorliegende Erfindung betrifft, kann beispielsweise in einem Fahrzeuggetriebe positioniert sein und/oder mit dem Arbeitsmedium des Getriebes, insbesondere Öl, betrieben werden. Wenn die Arbeitsmediumversorgung des Retarders über das Getriebearbeitsmedium erfolgt, so steht demgemäß auch nur der Arbeitsmediumdruck des Getriebes zum Befüllen des Arbeitsraumes des Retarders zur Verfügung.A hydrodynamic retarder, as the present invention relates to it, can be positioned, for example, in a vehicle transmission and/or can be operated with the working medium of the transmission, in particular oil. If the working medium is supplied to the retarder via the transmission working medium, only the working medium pressure of the transmission is available to fill the working chamber of the retarder.

Ein gattungsgemäßer Retarder wird in EP 2 300 696 B1 offenbart. Dieser hydrodynamische Retarder weist einen externen Arbeitsmediumkreislauf auf, dem Arbeitsmedium über eine Arbeitsmediumzufuhrleitung zugeführt werden kann, um den Arbeitsraum des Retarders zu befüllen. Die Arbeitsmediumzufuhrleitung ist hierfür an ein Retarderschaltventil angeschlossen und kann über dieses wahlweise mit einer Arbeitsmediumdruckleitung (Arbeitsdruckebene) und einer Tankleitung verbunden werden, sodass über die Arbeitsmediumzufuhrleitung auch Arbeitsmedium aus dem externen Arbeitsmediumkreislauf abgeführt werden kann. Die Befüllung und Entleerung des Arbeitsraumes des Retarders erfolgt dabei über eine sogenannte Spaltbefüllung beziehungsweise Spaltentleerung und den externen Arbeitsmediumkreislauf. Hierfür ist der externe Arbeitsmediumkreislauf an einem Arbeitsmediumeinlass und an einem Arbeitsmediumauslass angeschlossen, die jeweils auf einem Torusaußendurchmesser des Arbeitsraumes im Arbeitsraum münden. Aufgrund der Kreislaufströmung des Arbeitsmediums im Arbeitsraum herrscht auf diesem Torusaußendurchmesser ein vergleichsweise hoher Druck.A generic retarder is in EP 2 300 696 B1 disclosed. This hydrodynamic retarder has an external working medium circuit to which working medium can be supplied via a working medium supply line in order to fill the working chamber of the retarder. For this purpose, the working medium supply line is connected to a retarder switching valve and can be connected via this to a working medium pressure line (working pressure level) and a tank line, so that working medium can also be discharged from the external working medium circuit via the working medium supply line. The working chamber of the retarder is filled and emptied via what is known as gap filling or gap emptying and the external working medium circuit. For this purpose, the external working medium circuit is connected to a working medium inlet and a working medium outlet, which each open out into the working space on a torus outer diameter of the working space. Due to the circulatory flow of the working medium in the working space, there is a comparatively high pressure on this outer diameter of the torus.

Aus der DE19 616 427 A1 ist ein Retarder bekannt, bei dem zwischen Arbeitsmediumbehälter und dem hydrodynamischen Zentrums des Retarders eine Verbindungsleitung geschaltet ist, wobei sich in der Verbindungsleitung ein Ventil angeordnet ist.From the DE19 616 427 A1 a retarder is known in which a connecting line is connected between the working medium container and the hydrodynamic center of the retarder, with a valve being arranged in the connecting line.

Um nun ein bestimmtes Bremsmoment, das mit dem hydrodynamischen Retarder erzeugt werden soll, einzustellen, muss dem externen Arbeitsmediumkreislauf Arbeitsmedium zu- oder aus diesem abgeführt werden. Die Regelung dieser Zufuhr und Abfuhr kann beispielsweise durch das genannte Wegeventil mit dem Arbeitsmediumdruckleitungsanschluss und dem Tankleitungsanschluss erfolgen. Da jedoch der externe Arbeitsmediumkreislauf über den Arbeitsmediumeinlass auf dem Torusaußendurchmesser mündet, wird ein relativ großer Druck zum Befüllen des Kreislaufes benötigt. Dieser benötigte Druck kann größer sein als der maximal durch das Getriebearbeitsmedium zur Verfügung gestellte Druck, der durch die Druckversorgung des Getriebes festgelegt wird. Dies hat zur Folge, dass in diesem Fall nur vergleichsweise kleine Bremsmomente mit dem Retarder angesteuert werden können.In order to set a specific braking torque that is to be generated with the hydrodynamic retarder, working medium must be supplied to or removed from the external working medium circuit. This supply and discharge can be regulated, for example, by the named directional control valve with the working medium pressure line connection and the tank line connection. However, since the external working medium circuit opens out on the outer diameter of the torus via the working medium inlet, a relatively high pressure is required to fill the circuit. This required pressure can be greater than the maximum pressure made available by the transmission working medium, which is determined by the pressure supply of the transmission. The consequence of this is that in this case only comparatively small braking torques can be controlled with the retarder.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, einen gattungsgemäßen hydrodynamischen Retarder derart zu verbessern, dass auch bei kleineren Arbeitsmediumdrücken in der Arbeitsmediumdruckleitung ein ausreichend großes Bremsmoment mit dem hydrodynamischen Retarder erzeugt werden kann.The present invention is therefore based on the object of improving a generic hydrodynamic retarder in such a way that a sufficiently large braking torque can be generated with the hydrodynamic retarder even at lower working medium pressures in the working medium pressure line.

Die erfindungsgemäße Aufgabe wird durch einen hydrodynamischen Retarder mit den Merkmalen von Anspruch 1 gelöst. In den abhängigen Ansprüchen werden vorteilhafte und besonders zweckmäßige Ausgestaltungen der Erfindung angegeben.The object according to the invention is achieved by a hydrodynamic retarder with the features of claim 1. Advantageous and particularly expedient refinements of the invention are specified in the dependent claims.

Durch die erfindungsgemäße Lösung werden die verschiedenen unterschiedlichen Druckniveaus innerhalb des hydraulischen Systems im Arbeitsraumarbeitsmediumkreislauf und externen Arbeitsmediumkreislauf genutzt, um die Befüllung und Entleerung des Arbeitsraumes beziehungsweise die Einstellung des optimalen Füllungsgrades zu steuern oder zu regeln. Die Genauigkeit bei der Einstellung des gewünschten Arbeitsraumfüllungsgrades mit Arbeitsmedium kann verbessert werden. Vorteilhaft ist zugleich eine Minimierung des Rückflusses von heißem Arbeitsmedium, das im Arbeitsraum erwärmt wurde, in den Tank, der in der Regel durch den Ölsumpf des Getriebes gebildet wird.With the solution according to the invention, the various different pressure levels within the hydraulic system in the working space working medium circuit and external working medium circuit are used to control or regulate the filling and emptying of the working space or the setting of the optimal degree of filling. The accuracy when setting the desired degree of filling of the working space with working medium can be improved. At the same time, minimizing the return flow of hot working medium, which was heated in the working chamber, into the tank, which is usually formed by the oil sump of the transmission, is advantageous.

Im Einzelnen weist ein erfindungsgemäßer hydrodynamischer Retarder einen Rotor und einen Stator oder einen Rotor und einen Gegenlaufrotor auf, wobei der Rotor und der Stator beziehungsweise der Rotor und der Gegenlaufrotor gemeinsam einen torusförmigen, mit Arbeitsmedium befüllbaren Arbeitsraum ausbilden, um Drehmoment mittels eines hydrodynamischen Arbeitsraumarbeitsmediumkreislaufes vom Rotor auf den Stator beziehungsweise vom Rotor auf den Gegenlaufrotor zu übertragen und damit den Rotor abzubremsen. Bei dem Arbeitsmedium handelt es sich insbesondere um Öl, beispielsweise Getriebeöl, wenn der hydrodynamische Retarder an einem Fahrzeuggetriebe angeschlossen, aus dessen Ölversorgung versorgt und/oder in dieses Fahrzeuggetriebe integriert ist.In detail, a hydrodynamic retarder according to the invention has a rotor and a stator or a rotor and a counter-rotating rotor, the rotor and the stator or the rotor and the counter-rotating rotor together forming a toroidal working chamber that can be filled with working medium in order to transfer torque from the rotor by means of a hydrodynamic working chamber working medium circuit to the stator or from the rotor to the counter-rotating rotor and thus to brake the rotor. The working medium is in particular oil, for example transmission oil, if the hydrodynamic retarder is connected to a vehicle transmission, is supplied from its oil supply and/or is integrated into this vehicle transmission.

Der hydrodynamische Retarder weist ferner einen externen Arbeitsmediumkreislauf auf, in dem ein Wärmetauscher vorgesehen ist, um Wärme aus dem im Arbeitsraum erwärmten Arbeitsmedium abzuführen. Der externe Arbeitsmediumkreislauf ist über einen Arbeitsmediumeinlass und einen Arbeitsmediumauslass arbeitsmediumleitend am Arbeitsraum des Retarders angeschlossen, wobei der Arbeitsmediumeinlass und der Arbeitsmediumauslass auf einem Torusaußendurchmesser des Arbeitsraumes im Arbeitsraum münden. Das bedeutet, dass die Mündung auf dem Durchmesser der Toruswandung und - in einem Axialschnitt durch den Arbeitsraum gesehen - nicht radial weiter innen innerhalb des Torusquerschnitts positioniert ist. Beispielsweise münden der Arbeitsmediumeinlass und/oder der Arbeitsmediumauslass im Spalt zwischen den beiden sich in Axialrichtung gegenüberstehenden Schaufelrädern, die den Rotor und den Stator beziehungsweise den Rotor und den Gegenlaufrotor ausbilden.The hydrodynamic retarder also has an external working medium circuit in which a heat exchanger is provided in order to dissipate heat from the working medium heated in the working chamber. The external working medium circuit is connected via a working medium inlet and a working medium outlet to the working chamber of the retarder, the working medium inlet and the working medium outlet ending in the working chamber on a torus outside diameter of the working chamber. This means that the opening is on the diameter of the torus wall and—seen in an axial section through the working space—not radially further inwards is positioned within the torus cross-section. For example, the working medium inlet and/or the working medium outlet open in the gap between the two impellers facing one another in the axial direction, which form the rotor and the stator or the rotor and the counter-rotating rotor.

Es ist eine Arbeitsmediumzufuhrleitung vorgesehen, die im externen Arbeitsmediumkreislauf mündet.A working medium supply line is provided, which opens into the external working medium circuit.

Erfindungsgemäß ist ferner eine Kernringbefüllungsleitung arbeitsmediumleitend am Arbeitsraum des Retarders angeschlossen, wobei die Kernringbefüllungsleitung radial innerhalb des Torusaußendurchmessers in einem Kernring des Arbeitsraumes mündet. In einem solchen Kernring herrscht nämlich ein vergleichsweise geringer Druck, sodass auch bei einem begrenzten zur Verfügung stehenden Arbeitsmediumfülldruck der Arbeitsraum vergleichsweise leichter mit Arbeitsmedium befüllt werden kann.According to the invention, a core ring filling line is also connected to the working chamber of the retarder to carry the working medium, the core ring filling line opening radially inside the outer diameter of the torus in a core ring of the working chamber. A comparatively low pressure prevails in such a core ring, so that the working chamber can be filled with working medium comparatively more easily even if the working medium filling pressure available is limited.

Die erfindungsgemäße Ausgestaltung ermöglicht damit vorteilhaft eine Spaltbefüllung und Spaltentleerung, insbesondere reine Spaltbefüllung und reine Spaltentleerung des Arbeitsraumes, und zusätzlich hierzu, insbesondere in einer anderen Schaltstellung eines Wegeventils, mittels welchem die Arbeitsmediumzufuhrleitung bevorzugt an einer Arbeitsmediumdruckleitung und insbesondere an einer Tankleitung angeschlossen ist, eine Kernringbefüllung mit hiervon getrennter Spaltentleerung.The configuration according to the invention thus advantageously enables gap filling and gap emptying, in particular pure gap filling and pure gap emptying of the working space, and in addition to this, in particular in a different switching position of a directional control valve, by means of which the working medium supply line is preferably connected to a working medium pressure line and in particular to a tank line, core ring filling with separate gap emptying.

Bevorzugt erfolgt eine reine Kernringbefüllung gegen ein niedriges Druckniveau im Kernring aus einer Arbeitsmediumdruckleitung, insbesondere eines Getriebes, beispielsweise der Arbeitsdruckebene des Getriebes, wobei die Kernringbefüllungsleitung von Bereichen mit hohem Arbeitsmediumdruck im Arbeitsraum des Retarders und im externen Arbeitsmediumkreislauf getrennt ist. Die Abfuhr des Arbeitsmediums aus dem Arbeitsraum kann dabei über eine Spaltentleerung erfolgen. Damit kann bei der Arbeitsmediumzufuhr in den Arbeitsraum und der Arbeitsmediumabfuhr aus dem Arbeitsraum jeweils die maximal mögliche Druckdifferenz genutzt werden.Preference is given to pure core ring filling against a low pressure level in the core ring from a working medium pressure line, in particular a transmission, for example the working pressure level of the transmission, with the core ring filling line being separated from areas with high working medium pressure in the working chamber of the retarder and in the external working medium circuit. The removal of the working medium from the working space can take place via a gap emptying. This can in the working medium supply in the Working space and the working medium discharge from the working space are used in each case the maximum possible pressure difference.

Bevorzugt ist die Arbeitsmediumzufuhrleitung mittels eines Wegeventils an einer Arbeitsmediumdruckleitung und insbesondere an einer Tankleitung angeschlossen, wobei besonders vorteilhaft das Wegeventil als Druckwaage ausgeführt ist, dessen Steuerkolben einerseits mit dem Druck des externen Arbeitsmediumkreislaufes, insbesondere im oder hinter dem Arbeitsmediumauslass, und andererseits, in einer entgegengesetzten Richtung, mit einem Ansteuerdruck aus einer Steuerdruckleitung, über den das gewünschte Bremsmoment des hydrodynamischen Retarders vorgegeben wird und der insbesondere proportional zum gewünschten Bremsmoment ist, beaufschlagt wird.The working medium supply line is preferably connected to a working medium pressure line and in particular to a tank line by means of a directional valve, with the directional valve being particularly advantageously designed as a pressure compensator, the control piston of which is on the one hand connected to the pressure of the external working medium circuit, in particular in or behind the working medium outlet, and on the other hand in an opposite direction Direction, with a control pressure from a control pressure line, via which the desired braking torque of the hydrodynamic retarder is specified and which is in particular proportional to the desired braking torque, is applied.

Gemäß einer Ausführungsform der Erfindung zweigt die Kernringbefüllungsleitung aus der Arbeitsmediumzufuhrleitung ab. Besonders in diesem Fall ist es günstig, wenn in Strömungsrichtung des Arbeitsmediums in der Arbeitsmediumzufuhrleitung, bezogen auf eine Befüllung des externen Arbeitsmediumkreislaufes über die Arbeitsmediumzufuhrleitung mit Arbeitsmedium, hinter einer Abzweigstelle der Kernringbefüllungsleitung eine Drossel in der Arbeitsmediumzufuhrleitung vorgesehen ist, um eine vorgegebene Druckdifferenz in der Arbeitsmediumzufuhrleitung zu erzeugen.According to one embodiment of the invention, the core ring filling line branches off from the working medium supply line. Particularly in this case, it is favorable if, in the direction of flow of the working medium in the working medium supply line, based on a filling of the external working medium circuit via the working medium supply line with working medium, a throttle is provided in the working medium supply line behind a branching point of the core ring filling line in order to reduce a predetermined pressure difference in the working medium supply line to create.

Günstig ist ferner, wenn in der Kernringbefüllungsleitung eine Drossel zur Erzeugung einer vorgegebenen Druckdifferenz in der Kernringbefüllungsleitung vorgesehen ist.It is also favorable if a throttle is provided in the core ring filling line to generate a predetermined pressure difference in the core ring filling line.

Wenn beide Drosseln vorgesehen sind, können diese im Strömungsquerschnitt aufeinander abgestimmt werden, um das gewünschte Ausmaß der Kernringbefüllung zu erreichen.If both throttles are provided, they can be matched to one another in terms of flow cross-section in order to achieve the desired extent of core ring filling.

Die Drossel(n) kann/können als Konstantdrossel oder Verstelldrossel ausgeführt sein.The throttle(s) can be designed as a constant throttle or variable throttle.

Insbesondere bei Vorsehen der Abzweigung der Kernringbefüllungsleitung aus der Arbeitsmediumzufuhrleitung kann das Wegeventil als 3/2-Wegeventil ausgeführt sein, beispielsweise in Form der zuvor dargestellten Druckwaage.In particular, when the branching of the core ring filling line from the working medium supply line is provided, the directional valve can be designed as a 3/2-way valve, for example in the form of the pressure compensator shown above.

Gemäß einer alternativen Ausführungsform ist die Kernringbefüllungsleitung parallel zu und getrennt von der Arbeitsmediumzufuhrleitung vorgesehen. Das bedeutet, dass das durch die Arbeitsmediumzufuhrleitung strömende Arbeitsmedium nicht in die Kernringbefüllungsleitung strömen kann.According to an alternative embodiment, the core ring filling line is provided parallel to and separate from the working medium supply line. This means that the working medium flowing through the working medium supply line cannot flow into the core ring filling line.

Beispielsweise sind die Kernringbefüllungsleitung und die Arbeitsmediumzufuhrleitung an verschiedenen Anschlüssen oder Auslässen des Wegeventils angeschlossen. Besonders in diesem Fall kann das Wegeventil als 4/2-Wegeventil ausgeführt sein.For example, the core ring filling line and the working medium supply line are connected to different connections or outlets of the directional control valve. Especially in this case, the directional valve can be designed as a 4/2-way valve.

Gemäß einer bevorzugten Ausgestaltung der Erfindung ist die Arbeitsmediumzufuhrleitung in zwei entgegengesetzte Richtungen vom Arbeitsmedium durchströmbar, um über die Arbeitsmediumzufuhrleitung nicht nur Arbeitsmedium in den externen Arbeitsmediumkreislauf und damit den Arbeitsraum des Retarders zuführen zu können, sondern zu dessen Entleerung auch aus dem externen Arbeitsmediumkreislauf abführen zu können. Die Zufuhr und die Abfuhr können bevorzugt dabei in derselben Schaltstellung des Wegeventils erreicht werden und stellen sich in Abhängigkeit der herrschenden Druckverhältnisse ein, und insbesondere in Abhängigkeit des Ansteuerdruckes in der Steuerdruckleitung, über welchen das Retarderbremsmoment vorgegeben wird. Dabei ist es möglich, dass ein Steuerkolben des Wegeventils innerhalb derselben Schaltstellung um ein gewisses Ausmaß verschoben wird, damit die Steuerkanten die Druckdifferenz über dem Wegeventil einstellen, um das gewünschte Befüllen und Entleeren zu erreichen. Die Einstellung kann dabei beispielsweise durch die genannte Ausbildung des Wegeventils als Druckwaage erreicht werden.According to a preferred embodiment of the invention, the working medium supply line can be flowed through by the working medium in two opposite directions in order to not only be able to supply working medium via the working medium supply line to the external working medium circuit and thus the working chamber of the retarder, but also to be able to discharge it from the external working medium circuit in order to empty it . The supply and discharge can preferably be achieved in the same switching position of the directional control valve and are adjusted as a function of the prevailing pressure conditions, and in particular as a function of the control pressure in the control pressure line, via which the retarder braking torque is specified. It is possible that a control piston of the directional control valve is shifted to a certain extent within the same switching position, so that the control edges adjust the pressure difference across the directional control valve in order to achieve the desired filling and emptying. The setting can be achieved, for example, by the design of the directional control valve as a pressure compensator.

Bevorzugt sind im externen Arbeitsmediumkreislauf in Strömungsrichtung des Arbeitsmediums vor und hinter dem Wärmetauscher Wegeventile vorgesehen, um den Wärmetauscher wahlweise aus dem externen Arbeitsmediumkreislauf auszukoppeln. Beispielsweise ist ein Wegeventil in Strömungsrichtung vor dem Wärmetauscher vorgesehen, das den zugeordneten Anschluss des externen Arbeitsmediumkreislaufes wahlweise mit dem Wärmetauscher und wahlweise mit einer Tankleitung verbindet. In Strömungsrichtung des Arbeitsmediums hinter dem Wärmetauscher kann insbesondere ein Wegeventil vorgesehen sein, das den zugeordneten Anschluss des Wärmetauschers wahlweise mit dem Anschluss des externen Arbeitsmediumkreislaufes und einer Tankleitung verbindet, die zugleich arbeitsmediumleitend mit dem Wegeventil in oder vor der Arbeitsmediumzufuhrleitung verbunden sein kann.Directional valves are preferably provided in the external working medium circuit in the direction of flow of the working medium before and after the heat exchanger in order to selectively decouple the heat exchanger from the external working medium circuit. For example, a directional control valve is provided upstream of the heat exchanger in the direction of flow, which connects the associated connection of the external working medium circuit either to the heat exchanger and optionally to a tank line. In the direction of flow of the working medium behind the heat exchanger, in particular, a directional control valve can be provided, which optionally connects the associated connection of the heat exchanger to the connection of the external working medium circuit and a tank line, which can also be connected to the directional control valve in or before the working medium supply line to carry the working medium.

Auch bei einer Teilfüllung des Arbeitsraumes mit Arbeitsmedium, bei der kein Arbeitsmediumvolumen im Kernring vorhanden ist, ist durch den auf den Torusaußendurchmesser mündenden Arbeitsmediumauslass eine Arbeitsmediumabfuhr aus dem Arbeitsraum möglich, sodass auch besonders kleine Bremsmomente eingestellt werden können. Zugleich kann auch bei großen Drehzahlen des Retarders, die mit einem großen Arbeitsmediumdruck im Arbeitsmediumkreislauf einhergehen, durch die Kernringbefüllung eine Vollfüllung erreicht werden.Even if the working space is partially filled with working medium and there is no working medium volume in the core ring, the working medium outlet opening onto the outer diameter of the torus allows the working medium to be discharged from the working space, so that particularly small braking torques can also be set. At the same time, even at high speeds of the retarder, which are associated with a high working medium pressure in the working medium circuit, full filling can be achieved by filling the core ring.

Die Erfindung soll nachfolgend anhand von Ausführungsbeispielen und den Figuren exemplarisch beschrieben werden.The invention is to be described below by way of example using exemplary embodiments and the figures.

Es zeigen:

Figur 1
ein erstes Ausführungsbeispiel der Erfindung;
Figur 2
eine schematische Darstellung des Arbeitsmediumkreislaufes im Arbeitsraum des Retarders und die Anschlüsse am Arbeitsraum für einen erfindungsgemäßen Retarder;
Figur 3
ein weiteres Ausführungsbeispiel der Erfindung.
Show it:
figure 1
a first embodiment of the invention;
figure 2
a schematic representation of the working medium circuit in the working space of the retarder and the connections to the working space for a retarder according to the invention;
figure 3
another embodiment of the invention.

In der Figur 1 ist schematisch ein hydrodynamischer Retarder 1 mit einem externen Arbeitsmediumkreislauf 6 gezeigt. Der externe Arbeitsmediumkreislauf 6 ist über einen Arbeitsmediumeinlass 8 und einen Arbeitsmediumauslass 9 arbeitsmediumleitend an einem Arbeitsraum 4 des Retarders 1 angeschlossen. Details des Anschlusses und der Arbeitsraum 4 sind in der Figur 2 schematisch dargestellt.In the figure 1 a hydrodynamic retarder 1 with an external working medium circuit 6 is shown schematically. The external working medium circuit 6 is connected to a working chamber 4 of the retarder 1 via a working medium inlet 8 and a working medium outlet 9 . Details of the connection and the working space 4 are in the figure 2 shown schematically.

So wird der Arbeitsraum 4 durch einen beschaufelten Rotor 2 und einen beschaufelten Stator 3 gebildet. Der Rotor 2 und der Stator 3 stehen sich in Axialrichtung, das heißt in Richtung der Drehachse des Rotors 2, mit einem Axialspalt gegenüber. Durch Drehantreiben des Rotors 2 wird Arbeitsmedium im Arbeitsraum 4 radial nach außen beschleunigt, tritt in den Stator 3 ein, wird dort radial nach innen verzögert und tritt radial innen wieder in den Rotor 2 ein. Damit wird ein hydrodynamischer Arbeitsraumarbeitsmediumkreislauf 5 gebildet.The working chamber 4 is formed by a bladed rotor 2 and a bladed stator 3 . The rotor 2 and the stator 3 face each other in the axial direction, ie in the direction of the axis of rotation of the rotor 2, with an axial gap. By rotating the rotor 2 , the working medium in the working chamber 4 is accelerated radially outwards, enters the stator 3 , is decelerated there radially inwards and re-enters the rotor 2 radially inwards. A hydrodynamic working space working medium circuit 5 is thus formed.

Der im Querschnitt dargestellte Arbeitsraum 4 ist über dem Umfang der Drehachse des Rotors 2 torusförmig, wobei der Torus einen entsprechenden Torusaußendurchmesser D aufweist. Der Torusaußendurchmesser D bezieht sich dabei auf den Durchmesser des Vollkreises, aus welchem der Torus im mathematischen Sinne durch Rotation um die Drehachse gebildet wird. Zumindest in etwa in der Mitte des Torusaußendurchmessers D beziehungsweise des Arbeitsraumes 4 befindet sich der sogenannte Kernring 12 des Arbeitsraumes 4, der entsprechend durch das Auge des Arbeitsraumarbeitsmediumkreislaufes 5 bestimmt wird. Sowohl der Arbeitsmediumeinlass 8 als auch der Arbeitsmediumauslass 9 münden auf dem Torusaußendurchmesser D des Arbeitsraumes 4 im Arbeitsraum 4.The working space 4 shown in cross-section is toroidal over the circumference of the axis of rotation of the rotor 2 , the torus having a corresponding outer toroidal diameter D . The outer torus diameter D refers to the diameter of the full circle from which the torus is formed in the mathematical sense by rotation around the axis of rotation. The so-called core ring 12 of the work space 4 is located at least approximately in the middle of the outer torus diameter D or of the work space 4 , which is correspondingly determined by the eye of the work space working medium circuit 5 . Both the working medium inlet 8 and the Working medium outlet 9 open out on the torus outside diameter D of the working space 4 in the working space 4.

Zusätzlich mündet im Arbeitsraum 4 die Kernringbefüllungsleitung 11. Diese Kernringbefüllungsleitung 11 mündet im Kernring 12, also an einer Stelle des Arbeitsraumes 4 mit vergleichsweise geringem Arbeitsmediumdruck, insbesondere dem geringsten Arbeitsmediumdruck, wohingegen besonders der Arbeitsmediumauslass 9 an einer Stelle hohen Druckes im Arbeitsraum 4 mündet. Hierzu kann die Mündung des Arbeitsmediumauslasses 9 beispielsweise auch weiter radial außen im Arbeitsraum 4, bezogen auf die Drehachse des Rotors 2, vorgesehen sein. Insbesondere können die hier dargestellten Positionen des Arbeitsmediumeinlasses 8 und des Arbeitsmediumauslasses 9 miteinander getauscht sein. Ferner ist es nicht zwingend notwendig, dass der Arbeitsmediumeinlass 8 und/oder der Arbeitsmediumauslass 9 im gezeigten Spalt zwischen dem Rotor 2 und dem Stator 3 mündet/münden.In addition, the core ring filling line 11 opens in the working space 4. This core ring filling line 11 opens in the core ring 12, i.e. at a point in the working space 4 with a comparatively low working medium pressure, in particular the lowest working medium pressure, whereas the working medium outlet 9 in particular opens at a point of high pressure in the working space 4. For this purpose, the opening of the working medium outlet 9 can, for example, also be provided further radially outwards in the working chamber 4 in relation to the axis of rotation of the rotor 2 . In particular, the positions of the working medium inlet 8 and the working medium outlet 9 shown here can be interchanged with one another. Furthermore, it is not absolutely necessary for the working medium inlet 8 and/or the working medium outlet 9 to open out in the gap shown between the rotor 2 and the stator 3 .

In der Figur 1 ist dargestellt, dass die Kernringbefüllungsleitung 11 zusätzlich zu einer Arbeitsmediumzufuhrleitung 10 vorgesehen ist, die insbesondere außerhalb eines Retardergehäuses am externen Arbeitsmediumkreislauf 6 angeschlossen ist. Die Arbeitsmediumzufuhrleitung 10 und die Kernringbefüllungsleitung 11 sind jedoch an Anschlüssen eines gemeinsamen Wegeventils 16 angeschlossen, das als Druckwaage ausgebildet ist. Das Wegeventil 16 weist zwei Schaltstellungen auf und zusätzlich zu den genannten Anschlüssen der Arbeitsmediumzufuhrleitung 10 und der Kernringbefüllungsleitung 11 einen Anschluss für eine Arbeitsmediumdruckleitung 17 und einen Anschluss für eine Tankleitung 18. Das Wegeventil 16 ist somit als 4/2-Wegeventil ausgeführt.In the figure 1 it is shown that the core ring filling line 11 is provided in addition to a working medium supply line 10 which is connected in particular to the external working medium circuit 6 outside of a retarder housing. However, the working medium supply line 10 and the core ring filling line 11 are connected to connections of a common directional control valve 16, which is designed as a pressure compensator. The directional control valve 16 has two switching positions and, in addition to the connections mentioned for the working medium supply line 10 and the core ring filling line 11, a connection for a working medium pressure line 17 and a connection for a tank line 18. The directional control valve 16 is therefore designed as a 4/2-way valve.

Von den einander entgegengesetzt positionierten und gegeneinander wirkenden Druckanschlüssen des Wegeventils 16 ist einer mit dem externen Arbeitsmediumkreislauf 6 hinter dem Arbeitsmediumauslass 9 verbunden und der andere mit einer Steuerdruckleitung 21, über deren Steuerdruck das gewünschte Bremsmoment des hydrodynamischen Retarders 1 eingestellt wird, verbunden. Die Steuerdruckleitung 21 beaufschlagt ferner ein Wegeventil 19 in Strömungsrichtung des Arbeitsmediums im externen Arbeitsmediumkreislauf 6 vor einem Wärmetauscher 7 und ein Wegeventil 20 in Strömungsrichtung des Arbeitsmediums im externen Arbeitsmediumkreislauf 6 hinter dem Wärmetauscher 7. Damit ist es möglich, den Wärmetauscher 7 wahlweise in den und aus dem externen Arbeitsmediumkreislauf 6 zu schalten, um den Wärmetauscher 7 zum Kühlen des Arbeitsmediums aus dem Retarder 1 oder für andere Kühlzwecke zu verwenden. In der Figur 1 ist dabei der herausgeschaltete Zustand des Wärmetauschers 7 gezeigt, bei welchem der externe Arbeitsmediumkreislauf 6 ausgangsseitig des Wegeventils 19 mit dem Tank 22 verbunden ist und das Wegeventil 20 den Wärmetauscher 7 mit der Tankleitung 18 verbindet.One of the oppositely positioned and counteracting pressure connections of the directional control valve 16 is connected to the external working medium circuit 6 behind the working medium outlet 9 and the other to a control pressure line 21, via the control pressure of which the desired Braking torque of the hydrodynamic retarder 1 is set, connected. The control pressure line 21 also acts on a directional valve 19 in the direction of flow of the working medium in the external working medium circuit 6 upstream of a heat exchanger 7 and a directional valve 20 in the direction of flow of the working medium in the external working medium circuit 6 downstream of the heat exchanger 7. This makes it possible to switch the heat exchanger 7 on and off as desired to switch the external working medium circuit 6 in order to use the heat exchanger 7 for cooling the working medium from the retarder 1 or for other cooling purposes. In the figure 1 the switched-off state of the heat exchanger 7 is shown, in which the external working medium circuit 6 is connected to the tank 22 on the output side of the directional control valve 19 and the directional control valve 20 connects the heat exchanger 7 to the tank line 18 .

Wie durch den Doppelpfeil angedeutet ist, kann die Arbeitsmediumzufuhrleitung 10 in beide Richtungen vom Arbeitsmedium durchströmt werden, entweder um Arbeitsmedium dem externen Arbeitsmediumkreislauf 6 zuzuführen oder aus diesem abzuführen.As indicated by the double arrow, the working medium supply line 10 can be flowed through by the working medium in both directions, either to supply working medium to the external working medium circuit 6 or to remove it from it.

Bei der Ausgestaltung gemäß der Figur 3 ist der Anschluss der Kernringbefüllungsleitung 11 verschieden zum Ausführungsbeispiel gemäß der Figur 1 ausgeführt. Im Übrigen wird auf die Darstellung zu den Figuren 1 und 2 verwiesen, wobei dieselben Bezugszeichen für die sich entsprechenden Bauteile verwendet werden.In the design according to figure 3 the connection of the core ring filling line 11 is different from the embodiment according to FIG figure 1 executed. Incidentally, on the presentation of the Figures 1 and 2 referenced, the same reference numerals being used for corresponding components.

Beim Ausführungsbeispiel gemäß der Figur 3 zweigt die Kernringbefüllungsleitung 11 aus der Arbeitsmediumzufuhrleitung 10 ab. Um die geeigneten Druckverhältnisse herzustellen, sind die Drosseln 14 und 15 vorgesehen, die Drossel 14 in der Arbeitsmediumzufuhrleitung 10 hinter der Abzweigstelle der Kernringbefüllungsleitung 11 und die Drossel 15 in der Kernringbefüllungsleitung 11.In the embodiment according to figure 3 the core ring filling line 11 branches off from the working medium supply line 10 . In order to create the appropriate pressure conditions, the throttles 14 and 15 are provided, the throttle 14 in the working medium supply line 10 behind the branch point of the core ring filling line 11 and the throttle 15 in the core ring filling line 11.

Das Wegeventil 16 kann damit als 3/2-Wegeventil ausgeführt sein, entsprechend mit nur drei Anschlüssen, da die separate Verbindung der Arbeitsmediumdruckleitung 17 mit der Kernringbefüllungsleitung 11, wie in der Figur 1 gezeigt, entfallen kann.The directional control valve 16 can thus be designed as a 3/2-way valve, with only three connections, since the separate connection of the working medium pressure line 17 to the core ring filling line 11, as in FIG figure 1 shown can be omitted.

Die Abzweigstelle der Kernringbefüllungsleitung 11 von der Arbeitsmediumzufuhrleitung 10 ist mit 13 bezeichnet.The branching point of the core ring filling line 11 from the working medium supply line 10 is denoted by 13 .

BezugszeichenlisteReference List

11
Retarderretarders
22
Rotorrotor
33
Statorstator
44
Arbeitsraumworking space
55
Arbeitsraumarbeitsmediumkreislaufworking space working medium circuit
66
externer Arbeitsmediumkreislaufexternal working medium circuit
77
Wärmetauscherheat exchanger
88th
Arbeitsmediumeinlassworking medium inlet
99
Arbeitsmediumauslassworking medium outlet
1010
ArbeitsmediumzufuhrleitungWorking medium supply line
1111
Kernringbefüllungsleitungcore ring filling line
1212
Kernringcore ring
1313
Abzweigstellejunction
1414
Drosselthrottle
1515
Drosselthrottle
1616
Wegeventildirectional valve
1717
Arbeitsmediumdruckleitungworking medium pressure line
1818
Tankleitungtank line
1919
Wegeventildirectional valve
2020
Wegeventildirectional valve
2121
Steuerdruckleitungcontrol pressure line
2222
Tanktank
DD
Torusaußendurchmessertorus outer diameter

Claims (10)

  1. Hydrodynamic retarder (1) having a rotor (2) and a stator (3), or having a rotor (2) and a counter-rotor (3), which together form a toroidal working chamber (4), which is fillable with working medium, in order for torque to be transmitted by means of a hydrodynamic working-chamber working-medium circuit (5) ;
    having an external working-medium circuit (6) in which provision is made of a heat exchanger (7) for removal of heat from the working medium, wherein the external working-medium circuit (6) is connected in a working-medium-conducting manner to the working chamber (4) via a working-medium inlet (8) and a working-medium outlet (9), and the working medium inlet (8) and the working-medium outlet (9) open out into the working chamber (4) at a torus outer diameter (D) of the working chamber (4);
    having a working-medium feed line (10) which opens out into the external working-medium circuit (6);
    characterized in that
    a core-ring-filling line (11) is connected in a working-medium-conducting manner to the working chamber (4) and opens out into a core ring (12) of the working chamber (4) radially inside the torus outer diameter (D), wherein the working-medium feed line (10) is connected to a working-medium pressure line (17), and in particular to a tank line (18), by means of a directional valve (16).
  2. Hydrodynamic retarder (1) according to Claim 1, characterized in that the core-ring-filling line (11) branches off from the working-medium feed line (10) .
  3. Hydrodynamic retarder (2) according to Claim 2, characterized in that, behind a branch point (13) of the core-ring-filling line (11) in the flow direction of the working medium into the working chamber (4) via the working-medium feed line (10), provision is made of a throttle (14) for generating a predefined pressure difference in the working-medium feed line (10).
  4. Hydrodynamic retarder (1) according to Claim 3, characterized in that, in the core-ring-filling line (11), provision is made of a throttle (15) for generating a predefined pressure difference.
  5. Hydrodynamic retarder (1) according to one of Claims 2 to 4, characterized in that the directional valve (16) is in the form of a 3/2-way valve.
  6. Hydrodynamic retarder (1) according to Claim 1, characterized in that the core-ring-filling line (11) is provided parallel to and separate from the working-medium feed line (10).
  7. Hydrodynamic retarder (1) according to Claims 1 and 6, characterized in that the core-ring-filling line (11) and the working-medium feed line (10) are connected to different outlets of the directional valve (16).
  8. Hydrodynamic retarder (1) according to Claim 7, characterized in that the directional valve (16) is in the form of a 4/2-way valve.
  9. Hydrodynamic retarder (1) according to one of Claims 1 to 8, characterized in that the working-medium feed line (10) is able to be flowed through by the working medium in two opposite directions in order for working medium to be selectively introduced into the external working-medium circuit (6) and removed therefrom.
  10. Hydrodynamic retarder (1) according to one of Claims 1 to 9, characterized in that, in the external working-medium circuit (6), provision is made in front of and behind the heat exchanger (7) in the flow direction of the working medium of in each case at least one directional valve (19, 20) in order for the heat exchanger (7) to be uncoupled from the external working-medium circuit (6) .
EP19765438.7A 2018-09-13 2019-09-04 Hydrodynamic retarder Active EP3849859B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018122337.4A DE102018122337A1 (en) 2018-09-13 2018-09-13 Hydrodynamic retarder
PCT/EP2019/073524 WO2020053039A1 (en) 2018-09-13 2019-09-04 Hydrodynamic retarder

Publications (3)

Publication Number Publication Date
EP3849859A1 EP3849859A1 (en) 2021-07-21
EP3849859C0 EP3849859C0 (en) 2023-08-09
EP3849859B1 true EP3849859B1 (en) 2023-08-09

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DE (1) DE102018122337A1 (en)
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DE102018122337A1 (en) * 2018-09-13 2020-03-19 Voith Patent Gmbh Hydrodynamic retarder

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CN112739585A (en) 2021-04-30
EP3849859A1 (en) 2021-07-21
DE102018122337A1 (en) 2020-03-19
CN112739585B (en) 2023-05-26
US20220041148A1 (en) 2022-02-10
WO2020053039A1 (en) 2020-03-19
EP3849859C0 (en) 2023-08-09
US11639163B2 (en) 2023-05-02

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